题目

--I'm told that John had another car accident this morning.  --I believe not. He  _________so careless. A. shouldn't have been          B. wouldn't have been C. couldn't have been           D. mustn't have been 答案：C 解析: 本题考查时态的掌握情况，问句是“有人告诉我约翰今天早晨出了交通事故”，答句应为“我不相信，他不可能这么不小心。”只有C项为此意思，shouldn't have done表示“本来不应该……”，mustn't have done表示“禁止做”。

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